Merge pull request #353 from YosysHQ/generic-frontend

New hierarchy-capable generic frontend framework and json11 based JSON frontend

1 files changed, 0 insertions, 1028 deletions

diff --git a/json/jsonparse.cc b/json/jsonparse.cc
deleted file mode 100644
index fb712b28..00000000
--- a/json/jsonparse.cc
+++ /dev/null
@@ -1,1028 +0,0 @@
-/*
- *  nextpnr -- Next Generation Place and Route
- *
- *  Copyright (C) 2018  SymbioticEDA
- *
- *  jsonparse.cc -- liberally copied from the yosys file of the same name by
- *
- *  Copyright (C) 2018  Clifford Wolf <clifford@symbioticeda.com>
- *
- *  Permission to use, copy, modify, and/or distribute this software for any
- *  purpose with or without fee is hereby granted, provided that the above
- *  copyright notice and this permission notice appear in all copies.
- *
- *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-
-#include "jsonparse.h"
-#include <assert.h>
-#include <fstream>
-#include <iostream>
-#include <iterator>
-#include <log.h>
-#include <map>
-#include <string>
-#include "nextpnr.h"
-
-NEXTPNR_NAMESPACE_BEGIN
-
-extern bool check_all_nets_driven(Context *ctx);
-
-namespace JsonParser {
-
-const bool json_debug = false;
-
-typedef std::string string;
-
-template <typename T> int GetSize(const T &obj) { return obj.size(); }
-
-struct JsonNode
-{
-    char type; // S=String, N=Number, A=Array, D=Dict
-    string data_string;
-    int data_number;
-    std::vector<JsonNode *> data_array;
-    std::map<string, JsonNode *> data_dict;
-    std::vector<string> data_dict_keys;
-
-    JsonNode(std::istream &f, int &lineno)
-    {
-        type = 0;
-        data_number = 0;
-
-        while (1) {
-            int ch = f.get();
-
-            if (ch == EOF)
-                log_error("Unexpected EOF in JSON file.\n");
-
-            if (ch == '\n')
-                lineno++;
-            if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n')
-                continue;
-
-            if (ch == '\"') {
-                type = 'S';
-
-                while (1) {
-                    ch = f.get();
-
-                    if (ch == EOF)
-                        log_error("Unexpected EOF in JSON string.\n");
-
-                    if (ch == '\"')
-                        break;
-
-                    if (ch == '\\') {
-                        int ch = f.get();
-
-                        if (ch == EOF)
-                            log_error("Unexpected EOF in JSON string.\n");
-                    }
-
-                    data_string += ch;
-                }
-
-                break;
-            }
-
-            if (('0' <= ch && ch <= '9') || ('-' == ch)) {
-                type = 'N';
-                if (ch == '-')
-                    data_number = 0;
-                else
-                    data_number = ch - '0';
-                data_string += ch;
-
-                while (1) {
-                    ch = f.get();
-
-                    if (ch == EOF)
-                        break;
-
-                    if (ch == '.')
-                        goto parse_real;
-
-                    if (ch < '0' || '9' < ch) {
-                        f.unget();
-                        break;
-                    }
-
-                    data_number = data_number * 10 + (ch - '0');
-                    data_string += ch;
-                }
-
-                if (data_string[0] == '-')
-                    data_number = -data_number;
-                data_string = "";
-                break;
-
-            parse_real:
-                type = 'S';
-                data_number = 0;
-                data_string += ch;
-
-                while (1) {
-                    ch = f.get();
-
-                    if (ch == EOF)
-                        break;
-
-                    if (ch < '0' || '9' < ch) {
-                        f.unget();
-                        break;
-                    }
-
-                    data_string += ch;
-                }
-
-                break;
-            }
-
-            if (ch == '[') {
-                type = 'A';
-
-                while (1) {
-                    ch = f.get();
-
-                    if (ch == EOF)
-                        log_error("Unexpected EOF in JSON file.\n");
-
-                    if (ch == '\n')
-                        lineno++;
-                    if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == ',')
-                        continue;
-
-                    if (ch == ']')
-                        break;
-
-                    f.unget();
-                    data_array.push_back(new JsonNode(f, lineno));
-                }
-
-                break;
-            }
-
-            if (ch == '{') {
-                type = 'D';
-
-                while (1) {
-                    ch = f.get();
-
-                    if (ch == EOF)
-                        log_error("Unexpected EOF in JSON file.\n");
-
-                    if (ch == '\n')
-                        lineno++;
-                    if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == ',')
-                        continue;
-
-                    if (ch == '}')
-                        break;
-
-                    f.unget();
-                    JsonNode key(f, lineno);
-
-                    while (1) {
-                        ch = f.get();
-
-                        if (ch == EOF)
-                            log_error("Unexpected EOF in JSON file.\n");
-
-                        if (ch == '\n')
-                            lineno++;
-                        if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == ':')
-                            continue;
-
-                        f.unget();
-                        break;
-                    }
-
-                    JsonNode *value = new JsonNode(f, lineno);
-
-                    if (key.type != 'S')
-                        log_error("Unexpected non-string key in JSON dict, line %d.\n", lineno);
-
-                    data_dict[key.data_string] = value;
-                    data_dict_keys.push_back(key.data_string);
-                }
-
-                break;
-            }
-
-            log_error("Unexpected character in JSON file, line %d: '%c'\n", lineno, ch);
-        }
-    }
-
-    ~JsonNode()
-    {
-        for (auto it : data_array)
-            delete it;
-        for (auto &it : data_dict)
-            delete it.second;
-    }
-};
-
-inline Property json_parse_attr_param_value(JsonNode *node)
-{
-    Property value;
-
-    if (node->type == 'S') {
-        value = Property::from_string(node->data_string);
-    } else if (node->type == 'N') {
-        value = Property(node->data_number, 32);
-    } else if (node->type == 'A') {
-        log_error("JSON attribute or parameter value is an array.\n");
-    } else if (node->type == 'D') {
-        log_error("JSON attribute or parameter value is a dict.\n");
-    } else {
-        log_abort();
-    }
-
-    return value;
-}
-
-void ground_net(Context *ctx, NetInfo *net)
-{
-    std::unique_ptr<CellInfo> cell = std::unique_ptr<CellInfo>(new CellInfo);
-    PortInfo port_info;
-    PortRef port_ref;
-
-    cell->name = ctx->id(net->name.str(ctx) + ".GND");
-    cell->type = ctx->id("GND");
-
-    port_info.name = ctx->id(cell->name.str(ctx) + "[]");
-    port_info.net = net;
-    port_info.type = PORT_OUT;
-
-    port_ref.cell = cell.get();
-    port_ref.port = port_info.name;
-
-    net->driver = port_ref;
-
-    cell->ports[port_info.name] = port_info;
-
-    ctx->cells[cell->name] = std::move(cell);
-}
-
-void vcc_net(Context *ctx, NetInfo *net)
-{
-    std::unique_ptr<CellInfo> cell = std::unique_ptr<CellInfo>(new CellInfo);
-    PortInfo port_info;
-    PortRef port_ref;
-
-    cell->name = ctx->id(net->name.str(ctx) + ".VCC");
-    cell->type = ctx->id("VCC");
-
-    port_info.name = ctx->id(cell->name.str(ctx) + "[]");
-    port_info.net = net;
-    port_info.type = PORT_OUT;
-
-    port_ref.cell = cell.get();
-    port_ref.port = port_info.name;
-
-    net->driver = port_ref;
-
-    cell->ports[port_info.name] = port_info;
-
-    ctx->cells[cell->name] = std::move(cell);
-}
-
-//
-// is_blackbox
-//
-// Checks the JsonNode for an attributes dictionary, with a "blackbox" entry.
-// An item is deemed to be a blackbox if this entry exists and if its
-// value is not zero.  If the item is a black box, this routine will return
-// true, false otherwise
-bool is_blackbox(JsonNode *node)
-{
-    JsonNode *attr_node, *bbox_node = nullptr, *wbox_node = nullptr;
-
-    if (node->data_dict.count("attributes") == 0)
-        return false;
-    attr_node = node->data_dict.at("attributes");
-    if (attr_node == NULL)
-        return false;
-    if (attr_node->type != 'D')
-        return false;
-    if (GetSize(attr_node->data_dict) == 0)
-        return false;
-    if (attr_node->data_dict.count("blackbox"))
-        bbox_node = attr_node->data_dict.at("blackbox");
-    if (attr_node->data_dict.count("whitebox"))
-        wbox_node = attr_node->data_dict.at("whitebox");
-    if (bbox_node == NULL && wbox_node == NULL)
-        return false;
-    if (bbox_node && bbox_node->type != 'N')
-        log_error("JSON module blackbox attribute value is not a number\n");
-    if (bbox_node && bbox_node->data_number == 0)
-        return false;
-    if (wbox_node && wbox_node->type != 'N')
-        log_error("JSON module whitebox attribute value is not a number\n");
-    if (wbox_node && wbox_node->data_number == 0)
-        return false;
-    return true;
-}
-
-void json_import_cell_params(Context *ctx, string &modname, CellInfo *cell, JsonNode *param_node,
-                             std::unordered_map<IdString, Property> *dest, int param_id)
-{
-    //
-    JsonNode *param;
-    IdString pId;
-    //
-    param = param_node->data_dict.at(param_node->data_dict_keys[param_id]);
-
-    pId = ctx->id(param_node->data_dict_keys[param_id]);
-    (*dest)[pId] = json_parse_attr_param_value(param);
-
-    if (json_debug)
-        log_info("    Added parameter \'%s\'=%s to cell \'%s\' "
-                 "of module \'%s\'\n",
-                 pId.c_str(ctx), cell->params[pId].as_string().c_str(), cell->name.c_str(ctx), modname.c_str());
-}
-
-void json_import_net_attrib(Context *ctx, string &modname, NetInfo *net, JsonNode *param_node,
-                            std::unordered_map<IdString, Property> *dest, int param_id)
-{
-    //
-    JsonNode *param;
-    IdString pId;
-    //
-    param = param_node->data_dict.at(param_node->data_dict_keys[param_id]);
-
-    pId = ctx->id(param_node->data_dict_keys[param_id]);
-    (*dest)[pId] = json_parse_attr_param_value(param);
-
-    if (json_debug)
-        log_info("    Added parameter \'%s\'=%s to net \'%s\' "
-                 "of module \'%s\'\n",
-                 pId.c_str(ctx), net->attrs[pId].as_string().c_str(), net->name.c_str(ctx), modname.c_str());
-}
-
-void json_import_top_attrib(Context *ctx, string &modname, JsonNode *param_node,
-                            std::unordered_map<IdString, Property> *dest, int param_id)
-{
-    //
-    JsonNode *param;
-    IdString pId;
-    //
-    param = param_node->data_dict.at(param_node->data_dict_keys[param_id]);
-
-    pId = ctx->id(param_node->data_dict_keys[param_id]);
-    (*dest)[pId] = json_parse_attr_param_value(param);
-
-    if (json_debug)
-        log_info("    Added parameter \'%s\'=%s module \'%s\'\n", pId.c_str(ctx), (*dest)[pId].as_string().c_str(),
-                 modname.c_str());
-}
-
-static int const_net_idx = 0;
-
-template <typename F>
-void json_import_ports(Context *ctx, const string &modname, const std::vector<IdString> &netnames,
-                       const string &obj_name, const string &port_name, JsonNode *dir_node, JsonNode *wire_group_node,
-                       bool upto, int start_offset, F visitor)
-{
-    // Examine a port of a cell or the design. For every bit of the port,
-    // the connected net will be processed and `visitor` will be called
-    // with (PortType dir, std::string name, NetInfo *net)
-    assert(dir_node);
-
-    if (json_debug)
-        log_info("    Examining port %s, node %s\n", port_name.c_str(), obj_name.c_str());
-
-    if (!wire_group_node)
-        log_error("JSON no connection match "
-                  "for port_direction \'%s\' of node \'%s\' "
-                  "in module \'%s\'\n",
-                  port_name.c_str(), obj_name.c_str(), modname.c_str());
-
-    assert(wire_group_node);
-
-    assert(dir_node->type == 'S');
-    assert(wire_group_node->type == 'A');
-
-    PortInfo port_info;
-
-    port_info.name = ctx->id(port_name);
-    if (dir_node->data_string.compare("input") == 0)
-        port_info.type = PORT_IN;
-    else if (dir_node->data_string.compare("output") == 0)
-        port_info.type = PORT_OUT;
-    else if (dir_node->data_string.compare("inout") == 0)
-        port_info.type = PORT_INOUT;
-    else
-        log_error("JSON unknown port direction \'%s\' in node \'%s\' "
-                  "of module \'%s\'\n",
-                  dir_node->data_string.c_str(), obj_name.c_str(), modname.c_str());
-    //
-    // Find an update, or create a net to connect
-    // to this port.
-    //
-    NetInfo *this_net = nullptr;
-    bool is_bus;
-
-    //
-    // If this port references a bus, then there will be multiple nets
-    // connected to it, all specified as part of an array.
-    //
-    is_bus = (wire_group_node->data_array.size() > 1);
-
-    // Now loop through all of the connections to this port.
-    if (wire_group_node->data_array.size() == 0) {
-        //
-        // There is/are no connections to this port.
-        //
-        // Create the port, but leave the net NULL
-
-        visitor(port_info.type, port_info.name.str(ctx), nullptr);
-
-        if (json_debug)
-            log_info("      Port \'%s\' has no connection in \'%s\'\n", port_info.name.c_str(ctx), obj_name.c_str());
-
-    } else
-        for (int index = 0; index < int(wire_group_node->data_array.size()); index++) {
-            //
-            JsonNode *wire_node;
-            PortInfo this_port;
-            IdString net_id;
-            //
-            wire_node = wire_group_node->data_array[index];
-            //
-            // Pick a name for this port
-            int ndx = index + start_offset;
-            if (upto)
-                ndx = start_offset + wire_group_node->data_array.size() - index - 1;
-            if (is_bus)
-                this_port.name = ctx->id(port_info.name.str(ctx) + "[" + std::to_string(ndx) + "]");
-            else
-                this_port.name = port_info.name;
-            this_port.type = port_info.type;
-
-            if (wire_node->type == 'N') {
-                int net_num;
-
-                // A simple net, specified by a number
-                net_num = wire_node->data_number;
-                if (net_num < int(netnames.size()))
-                    net_id = netnames.at(net_num);
-                else
-                    net_id = ctx->id(std::to_string(net_num));
-                if (ctx->nets.count(net_id) == 0) {
-                    // The net doesn't exist in the design (yet)
-                    // Create in now
-
-                    if (json_debug)
-                        log_info("      Generating a new net, \'%d\'\n", net_num);
-
-                    std::unique_ptr<NetInfo> net = std::unique_ptr<NetInfo>(new NetInfo());
-                    net->name = net_id;
-                    net->driver.cell = NULL;
-                    net->driver.port = IdString();
-                    ctx->nets[net_id] = std::move(net);
-
-                    this_net = ctx->nets[net_id].get();
-                } else {
-                    //
-                    // The net already exists within the design.
-                    // We'll connect to it
-                    //
-                    this_net = ctx->nets[net_id].get();
-                    if (json_debug)
-                        log_info("      Reusing net \'%s\', id \'%s\', "
-                                 "with driver \'%s\'\n",
-                                 this_net->name.c_str(ctx), net_id.c_str(ctx),
-                                 (this_net->driver.cell != NULL) ? this_net->driver.port.c_str(ctx) : "NULL");
-                }
-
-            } else if (wire_node->type == 'S') {
-                // Strings are only used to drive wires for the fixed
-                // values "0", "1", and "x".  Handle those constant
-                // values here.
-                //
-                // Constants always get their own new net
-                std::unique_ptr<NetInfo> net = std::unique_ptr<NetInfo>(new NetInfo());
-                net->name = ctx->id("$const_" + std::to_string(const_net_idx++));
-
-                if (wire_node->data_string.compare(string("0")) == 0) {
-
-                    if (json_debug)
-                        log_info("      Generating a constant "
-                                 "zero net\n");
-                    ground_net(ctx, net.get());
-
-                } else if (wire_node->data_string.compare(string("1")) == 0) {
-
-                    if (json_debug)
-                        log_info("      Generating a constant "
-                                 "one  net\n");
-                    vcc_net(ctx, net.get());
-
-                } else if (wire_node->data_string.compare(string("x")) == 0) {
-                    ground_net(ctx, net.get());
-                } else
-                    log_error("      Unknown fixed type wire node "
-                              "value, \'%s\'\n",
-                              wire_node->data_string.c_str());
-                IdString n = net->name;
-                ctx->nets[net->name] = std::move(net);
-                this_net = ctx->nets[n].get();
-            }
-
-            if (json_debug)
-                log_info("    Inserting port \'%s\' into cell \'%s\'\n", this_port.name.c_str(ctx), obj_name.c_str());
-            visitor(this_port.type, this_port.name.str(ctx), this_net);
-        }
-}
-
-void json_import_cell(Context *ctx, string modname, const std::vector<IdString> &netnames, JsonNode *cell_node,
-                      string cell_name)
-{
-    JsonNode *cell_type, *param_node, *attr_node;
-
-    cell_type = cell_node->data_dict.at("type");
-    if (cell_type == NULL)
-        return;
-
-    std::unique_ptr<CellInfo> cell = std::unique_ptr<CellInfo>(new CellInfo);
-
-    cell->name = ctx->id(cell_name);
-    assert(cell_type->type == 'S');
-    cell->type = ctx->id(cell_type->data_string);
-    // No BEL assignment here/yet
-
-    if (json_debug)
-        log_info("  Processing %s $ %s\n", modname.c_str(), cell->name.c_str(ctx));
-
-    param_node = cell_node->data_dict.at("parameters");
-    if (param_node->type != 'D')
-        log_error("JSON parameter list of \'%s\' is not a data dictionary\n", cell->name.c_str(ctx));
-
-    //
-    // Loop through all parameters, adding them into the
-    // design to annotate the cell
-    //
-    for (int paramid = 0; paramid < GetSize(param_node->data_dict_keys); paramid++) {
-
-        json_import_cell_params(ctx, modname, cell.get(), param_node, &cell->params, paramid);
-    }
-
-    attr_node = cell_node->data_dict.at("attributes");
-    if (attr_node->type != 'D')
-        log_error("JSON attribute list of \'%s\' is not a data dictionary\n", cell->name.c_str(ctx));
-
-    //
-    // Loop through all attributes, adding them into the
-    // design to annotate the cell
-    //
-    for (int attrid = 0; attrid < GetSize(attr_node->data_dict_keys); attrid++) {
-
-        json_import_cell_params(ctx, modname, cell.get(), attr_node, &cell->attrs, attrid);
-    }
-
-    //
-    // Now connect the ports of this module.  The ports are defined by
-    // both the port directions node as well as the connections node.
-    // Both should contain dictionaries having the same keys.
-    //
-
-    JsonNode *pdir_node = NULL;
-    if (cell_node->data_dict.count("port_directions") > 0) {
-
-        pdir_node = cell_node->data_dict.at("port_directions");
-        if (pdir_node->type != 'D')
-            log_error("JSON port_directions node of \'%s\' "
-                      "in module \'%s\' is not a "
-                      "dictionary\n",
-                      cell->name.c_str(ctx), modname.c_str());
-
-    } else if (cell_node->data_dict.count("ports") > 0) {
-        pdir_node = cell_node->data_dict.at("ports");
-        if (pdir_node->type != 'D')
-            log_error("JSON ports node of \'%s\' "
-                      "in module \'%s\' is not a "
-                      "dictionary\n",
-                      cell->name.c_str(ctx), modname.c_str());
-    }
-
-    JsonNode *connections = cell_node->data_dict.at("connections");
-    if (connections->type != 'D')
-        log_error("JSON connections node of \'%s\' "
-                  "in module \'%s\' is not a "
-                  "dictionary\n",
-                  cell->name.c_str(ctx), modname.c_str());
-
-    if (GetSize(pdir_node->data_dict_keys) != GetSize(connections->data_dict_keys))
-        log_error("JSON number of connections doesnt "
-                  "match number of ports in node \'%s\' "
-                  "of module \'%s\'\n",
-                  cell->name.c_str(ctx), modname.c_str());
-
-    //
-    // Loop through all of the ports of this logic element
-    //
-    for (int portid = 0; portid < GetSize(pdir_node->data_dict_keys); portid++) {
-        //
-        string port_name;
-        JsonNode *dir_node, *wire_group_node;
-        //
-
-        port_name = pdir_node->data_dict_keys[portid];
-        dir_node = pdir_node->data_dict.at(port_name);
-        wire_group_node = connections->data_dict.at(port_name);
-
-        json_import_ports(ctx, modname, netnames, cell->name.str(ctx), port_name, dir_node, wire_group_node, false, 0,
-                          [&cell, ctx](PortType type, const std::string &name, NetInfo *net) {
-                              cell->ports[ctx->id(name)] = PortInfo{ctx->id(name), net, type};
-                              PortRef pr;
-                              pr.cell = cell.get();
-                              pr.port = ctx->id(name);
-                              if (net != nullptr) {
-                                  if (type == PORT_IN || type == PORT_INOUT) {
-                                      net->users.push_back(pr);
-                                  } else if (type == PORT_OUT) {
-                                      if (net->driver.cell != nullptr)
-                                          log_error("multiple drivers on net '%s' (%s.%s and %s.%s)\n",
-                                                    net->name.c_str(ctx), net->driver.cell->name.c_str(ctx),
-                                                    net->driver.port.c_str(ctx), pr.cell->name.c_str(ctx),
-                                                    pr.port.c_str(ctx));
-                                      net->driver = pr;
-                                  }
-                              }
-                          });
-    }
-
-    ctx->cells[cell->name] = std::move(cell);
-    // check_all_nets_driven(ctx);
-}
-
-static void insert_iobuf(Context *ctx, NetInfo *net, PortType type, const string &name)
-{
-    // Instantiate a architecture-independent IO buffer connected to a given
-    // net, of a given type, and named after the IO port.
-    //
-    // During packing, this generic IO buffer will be converted to an
-    // architecure primitive.
-    //
-    if (ctx->settings.find(ctx->id("synth")) == ctx->settings.end()) {
-        std::unique_ptr<CellInfo> iobuf = std::unique_ptr<CellInfo>(new CellInfo());
-        iobuf->name = ctx->id(name);
-        std::copy(net->attrs.begin(), net->attrs.end(), std::inserter(iobuf->attrs, iobuf->attrs.begin()));
-        if (type == PORT_IN) {
-            if (ctx->verbose)
-                log_info("processing input port %s\n", name.c_str());
-            iobuf->type = ctx->id("$nextpnr_ibuf");
-            iobuf->ports[ctx->id("O")] = PortInfo{ctx->id("O"), net, PORT_OUT};
-            // Special case: input, etc, directly drives inout
-            if (net->driver.cell != nullptr) {
-                if (net->driver.cell->type != ctx->id("$nextpnr_iobuf"))
-                    log_error("Top-level input '%s' also driven by %s.%s.\n", name.c_str(),
-                              net->driver.cell->name.c_str(ctx), net->driver.port.c_str(ctx));
-                net = net->driver.cell->ports.at(ctx->id("I")).net;
-            }
-            assert(net->driver.cell == nullptr);
-            net->driver.port = ctx->id("O");
-            net->driver.cell = iobuf.get();
-        } else if (type == PORT_OUT) {
-            if (ctx->verbose)
-                log_info("processing output port %s\n", name.c_str());
-            iobuf->type = ctx->id("$nextpnr_obuf");
-            iobuf->ports[ctx->id("I")] = PortInfo{ctx->id("I"), net, PORT_IN};
-            PortRef ref;
-            ref.cell = iobuf.get();
-            ref.port = ctx->id("I");
-            net->users.push_back(ref);
-        } else if (type == PORT_INOUT) {
-            if (ctx->verbose)
-                log_info("processing inout port %s\n", name.c_str());
-            iobuf->type = ctx->id("$nextpnr_iobuf");
-            iobuf->ports[ctx->id("I")] = PortInfo{ctx->id("I"), nullptr, PORT_IN};
-
-            // Split the input and output nets for bidir ports
-            std::unique_ptr<NetInfo> net2 = std::unique_ptr<NetInfo>(new NetInfo());
-            net2->name = ctx->id("$" + net->name.str(ctx) + "$iobuf_i");
-            net2->driver = net->driver;
-            if (net->driver.cell != nullptr) {
-                net2->driver.cell->ports[net2->driver.port].net = net2.get();
-                net->driver.cell = nullptr;
-            }
-            iobuf->ports[ctx->id("I")].net = net2.get();
-            PortRef ref;
-            ref.cell = iobuf.get();
-            ref.port = ctx->id("I");
-            net2->users.push_back(ref);
-            ctx->nets[net2->name] = std::move(net2);
-
-            iobuf->ports[ctx->id("O")] = PortInfo{ctx->id("O"), net, PORT_OUT};
-            assert(net->driver.cell == nullptr);
-            net->driver.port = ctx->id("O");
-            net->driver.cell = iobuf.get();
-        } else {
-            assert(false);
-        }
-        ctx->cells[iobuf->name] = std::move(iobuf);
-    }
-
-    PortInfo pinfo;
-    pinfo.name = ctx->id(name);
-    pinfo.net = net;
-    pinfo.type = type;
-    ctx->ports[pinfo.name] = pinfo;
-}
-
-void json_import_toplevel_port(Context *ctx, const string &modname, const std::vector<IdString> &netnames,
-                               const string &portname, JsonNode *node)
-{
-    JsonNode *dir_node = node->data_dict.at("direction");
-    JsonNode *nets_node = node->data_dict.at("bits");
-    bool upto = false;
-    int start_offset = 0;
-    if (node->data_dict.count("upto") != 0) {
-        JsonNode *val = node->data_dict.at("upto");
-        if (val->type == 'N')
-            upto = val->data_number != 0;
-    }
-    if (node->data_dict.count("offset") != 0) {
-        JsonNode *val = node->data_dict.at("offset");
-        if (val->type == 'N')
-            start_offset = val->data_number;
-    }
-    json_import_ports(
-            ctx, modname, netnames, "Top Level IO", portname, dir_node, nets_node, upto, start_offset,
-            [ctx](PortType type, const std::string &name, NetInfo *net) { insert_iobuf(ctx, net, type, name); });
-}
-
-void json_import(Context *ctx, string modname, JsonNode *node)
-{
-    if (is_blackbox(node))
-        return;
-
-    log_info("Importing module %s\n", modname.c_str());
-    ctx->attrs[ctx->id("module")] = modname;
-    JsonNode *attr_node = node->data_dict.at("attributes");
-    for (int attrid = 0; attrid < GetSize(attr_node->data_dict_keys); attrid++) {
-        json_import_top_attrib(ctx, modname, attr_node, &ctx->attrs, attrid);
-    }
-
-    JsonNode *ports_parent = nullptr;
-    if (node->data_dict.count("ports") > 0)
-        ports_parent = node->data_dict.at("ports");
-
-    // Multiple labels might refer to the same net. For now we resolve conflicts thus:
-    //  - (toplevel) ports are always preferred
-    //  - names with fewer $ are always prefered
-    //  - between equal $ counts, fewer .s are prefered
-    //  - ties are resolved alphabetically
-    auto prefer_netlabel = [ports_parent](const std::string &a, const std::string &b) {
-        if (ports_parent != nullptr) {
-            if (ports_parent->data_dict.count(a))
-                return true;
-            if (ports_parent->data_dict.count(b))
-                return false;
-        }
-        if (b.empty())
-            return true;
-        long a_dollars = std::count(a.begin(), a.end(), '$'), b_dollars = std::count(b.begin(), b.end(), '$');
-        if (a_dollars < b_dollars)
-            return true;
-        else if (a_dollars > b_dollars)
-            return false;
-        long a_dots = std::count(a.begin(), a.end(), '.'), b_dots = std::count(b.begin(), b.end(), '.');
-        if (a_dots < b_dots)
-            return true;
-        else if (a_dots > b_dots)
-            return false;
-        return a < b;
-    };
-
-    // Import netnames
-    std::vector<std::vector<std::string>> netlabels;
-    if (node->data_dict.count("netnames")) {
-        JsonNode *cell_parent = node->data_dict.at("netnames");
-        for (int nnid = 0; nnid < GetSize(cell_parent->data_dict_keys); nnid++) {
-            JsonNode *here;
-
-            here = cell_parent->data_dict.at(cell_parent->data_dict_keys[nnid]);
-            std::string basename = cell_parent->data_dict_keys[nnid];
-            bool upto = false;
-            int start_offset = 0;
-            if (here->data_dict.count("upto") != 0) {
-                JsonNode *val = here->data_dict.at("upto");
-                if (val->type == 'N')
-                    upto = val->data_number != 0;
-            }
-            if (here->data_dict.count("offset") != 0) {
-                JsonNode *val = here->data_dict.at("offset");
-                if (val->type == 'N')
-                    start_offset = val->data_number;
-            }
-            if (here->data_dict.count("bits")) {
-                JsonNode *bits = here->data_dict.at("bits");
-                assert(bits->type == 'A');
-                size_t num_bits = bits->data_array.size();
-                for (size_t i = 0; i < num_bits; i++) {
-                    int netid = bits->data_array.at(i)->data_number;
-                    if (netid >= int(netlabels.size()))
-                        netlabels.resize(netid + 1);
-                    int ndx = i + start_offset;
-                    if (upto)
-                        ndx = start_offset + num_bits - i - 1;
-                    std::string name =
-                            basename + (num_bits == 1 ? "" : std::string("[") + std::to_string(ndx) + std::string("]"));
-                    netlabels.at(netid).push_back(name);
-                }
-            }
-        }
-    }
-    std::vector<IdString> netids;
-    for (size_t i = 0; i < netlabels.size(); i++) {
-        auto &labels = netlabels.at(i);
-        if (labels.empty()) {
-            // Backup for unnamed nets (not sure if these should actually happen)
-            netids.push_back(ctx->id("$nextpnr$unknown_netname$" + std::to_string(i)));
-        } else {
-            // Pick a primary name for the net according to a simple heuristic
-            std::string pref = labels.at(0);
-            for (size_t j = 1; j < labels.size(); j++)
-                if (prefer_netlabel(labels.at(j), pref))
-                    pref = labels.at(j);
-            netids.push_back(ctx->id(pref));
-        }
-    }
-    if (node->data_dict.count("cells")) {
-        JsonNode *cell_parent = node->data_dict.at("cells");
-        //
-        //
-        // Loop through all of the logic elements in a flattened design
-        //
-        //
-        for (int cellid = 0; cellid < GetSize(cell_parent->data_dict_keys); cellid++) {
-            JsonNode *here = cell_parent->data_dict.at(cell_parent->data_dict_keys[cellid]);
-            json_import_cell(ctx, modname, netids, here, cell_parent->data_dict_keys[cellid]);
-        }
-    }
-
-    if (ports_parent != nullptr) {
-        // N.B. ports must be imported after cells for tristate behaviour
-        // to be correct
-        // Loop through all ports, first non-tristate then tristate to handle
-        // interconnected ports correctly
-        for (int portid = 0; portid < GetSize(ports_parent->data_dict_keys); portid++) {
-            JsonNode *here;
-
-            here = ports_parent->data_dict.at(ports_parent->data_dict_keys[portid]);
-            JsonNode *dir_node = here->data_dict.at("direction");
-            NPNR_ASSERT(dir_node->type == 'S');
-            if (dir_node->data_string == "inout")
-                continue;
-            json_import_toplevel_port(ctx, modname, netids, ports_parent->data_dict_keys[portid], here);
-        }
-        for (int portid = 0; portid < GetSize(ports_parent->data_dict_keys); portid++) {
-            JsonNode *here;
-
-            here = ports_parent->data_dict.at(ports_parent->data_dict_keys[portid]);
-            JsonNode *dir_node = here->data_dict.at("direction");
-            NPNR_ASSERT(dir_node->type == 'S');
-            if (dir_node->data_string != "inout")
-                continue;
-            json_import_toplevel_port(ctx, modname, netids, ports_parent->data_dict_keys[portid], here);
-        }
-    }
-    if (node->data_dict.count("netnames")) {
-        JsonNode *net_parent = node->data_dict.at("netnames");
-        for (int nnid = 0; nnid < GetSize(net_parent->data_dict_keys); nnid++) {
-            JsonNode *here;
-
-            here = net_parent->data_dict.at(net_parent->data_dict_keys[nnid]);
-            std::string basename = net_parent->data_dict_keys[nnid];
-            if (here->data_dict.count("bits")) {
-                JsonNode *bits = here->data_dict.at("bits");
-                assert(bits->type == 'A');
-                size_t num_bits = bits->data_array.size();
-                for (size_t i = 0; i < num_bits; i++) {
-                    std::string name =
-                            basename + (num_bits == 1 ? "" : std::string("[") + std::to_string(i) + std::string("]"));
-                    IdString net_id = ctx->id(name);
-                    if (here->data_dict.count("attributes") && ctx->nets.find(net_id) != ctx->nets.end()) {
-                        NetInfo *this_net = ctx->nets[net_id].get();
-
-                        JsonNode *attr_node = here->data_dict.at("attributes");
-                        if (attr_node->type != 'D')
-                            log_error("JSON attribute list of \'%s\' is not a data dictionary\n",
-                                      this_net->name.c_str(ctx));
-
-                        //
-                        // Loop through all attributes, adding them into the
-                        // design to annotate the cell
-                        //
-                        for (int attrid = 0; attrid < GetSize(attr_node->data_dict_keys); attrid++) {
-                            json_import_net_attrib(ctx, modname, this_net, attr_node, &this_net->attrs, attrid);
-                        }
-                    }
-                }
-            }
-        }
-    }
-    // Import net aliases
-    for (size_t i = 0; i < netids.size(); i++) {
-        IdString netname = netids.at(i);
-        if (!ctx->nets.count(netname))
-            continue;
-        for (auto &label : netlabels.at(i)) {
-            IdString labelid = ctx->id(label);
-            NPNR_ASSERT(!ctx->net_aliases.count(labelid));
-            ctx->net_aliases[labelid] = netname;
-        }
-    }
-    check_all_nets_driven(ctx);
-    ctx->settings[ctx->id("synth")] = 1;
-}
-}; // End Namespace JsonParser
-
-bool parse_json_file(std::istream &f, std::string &filename, Context *ctx)
-{
-    try {
-        using namespace JsonParser;
-
-        if (!f)
-            log_error("failed to open JSON file.\n");
-
-        int lineno = 1;
-
-        JsonNode root(f, lineno);
-
-        if (root.type != 'D')
-            log_error("JSON root node is not a dictionary.\n");
-
-        if (root.data_dict.count("modules") != 0) {
-            JsonNode *modules = root.data_dict.at("modules");
-
-            if (modules->type != 'D')
-                log_error("JSON modules node is not a dictionary.\n");
-
-            for (auto &it : modules->data_dict)
-                json_import(ctx, it.first, it.second);
-        }
-
-        log_info("Checksum: 0x%08x\n", ctx->checksum());
-        log_break();
-        ctx->attributesToArchInfo();
-        return true;
-    } catch (log_execution_error_exception) {
-        return false;
-    }
-}
-
-bool load_json_settings(std::istream &f, std::string &filename, std::unordered_map<std::string, Property> &values)
-{
-    try {
-        using namespace JsonParser;
-
-        if (!f)
-            log_error("failed to open JSON file.\n");
-
-        int lineno = 1;
-
-        JsonNode root(f, lineno);
-
-        if (root.type != 'D')
-            log_error("JSON root node is not a dictionary.\n");
-
-        if (root.data_dict.count("modules") != 0) {
-            JsonNode *modules = root.data_dict.at("modules");
-
-            if (modules->type != 'D')
-                log_error("JSON modules node is not a dictionary.\n");
-
-            for (auto &it : modules->data_dict) {
-                JsonNode *node = it.second;
-                if (is_blackbox(node))
-                    continue;
-
-                if (node->data_dict.count("settings")) {
-                    JsonNode *attr_node = node->data_dict.at("settings");
-                    for (int attrid = 0; attrid < GetSize(attr_node->data_dict_keys); attrid++) {
-                        JsonNode *param = attr_node->data_dict.at(attr_node->data_dict_keys[attrid]);
-                        std::string pId = attr_node->data_dict_keys[attrid];
-                        values[pId] = json_parse_attr_param_value(param);
-                    }
-                }
-            }
-        }
-
-        return true;
-    } catch (log_execution_error_exception) {
-        return false;
-    }
-}
-
-NEXTPNR_NAMESPACE_END